Atrial fibrillation is a heart condition where electrical signals run rampantly through the heart causing the heart to pump blood inefficiently. (Which can lead to tiredness, shortness of breath)
A surgical procedure known as cardiac ablation can be performed during which nodes in the heart can be disabled and unable to conduct electricity if it is determined that they are unhealthy pathways for electrical impulses.
A normal heart rhythm involves just 2 nodes to maintain normal effective pumping of blood.
I had the ablation performed on me and I worked with 2 young guys who also needed the procedure done.